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APA075-TQGPP Datasheet(PDF) 79 Page - Actel Corporation |
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APA075-TQGPP Datasheet(HTML) 79 Page - Actel Corporation |
79 / 174 page ProASICPLUS Flash Family FPGAs v5.7 1-73 Pin Description User Pins I/O User Input/Output The I/O pin functions as an input, output, tristate, or bidirectional buffer. Input and output signal levels are compatible with standard LVTTL and LVCMOS specifications. Unused I/O pins are configured as inputs with pull-up resistors. NC No Connect To maintain compatibility with other Actel ProASICPLUS products, it is recommended that this pin not be connected to the circuitry on the board. GL Global Pin Low skew input pin for clock or other global signals. This pin can be configured with an internal pull-up resistor. When it is not connected to the global network or the clock conditioning circuit, it can be configured and used as a normal I/O. GLMX Global Multiplexing Pin Low skew input pin for clock or other global signals. This pin can be used in one of two special ways (refer to Actel’s Using ProASICPLUS Clock Conditioning Circuits). When the external feedback option is selected for the PLL block, this pin is routed as the external feedback source to the clock conditioning circuit. In applications where two different signals access the same global net at different times through the use of GLMXx and GLMXLx macros, this pin will be fixed as one of the source pins. This pin can be configured with an internal pull-up resistor. When it is not connected to the global network or the clock conditioning circuit, it can be configured and used as any normal I/O. If not used, the GLMXx pin will be configured as an input with pull-up. Dedicated Pins GND Ground Common ground supply voltage. VDD Logic Array Power Supply Pin 2.5 V supply voltage. VDDP I/O Pad Power Supply Pin 2.5 V or 3.3 V supply voltage. TMS Test Mode Select The TMS pin controls the use of boundary-scan circuitry. This pin has an internal pull-up resistor. TCK Test Clock Clock input pin for boundary scan (maximum 10 MHz). Actel recommends adding a nominal 20 k Ω pull-up resistor to this pin. TDI Test Data In Serial input for boundary scan. A dedicated pull-up resistor is included to pull this pin high when not being driven. TDO Test Data Out Serial output for boundary scan. Actel recommends adding a nominal 20k Ω pull-up resistor to this pin. TRST Test Reset Input Asynchronous, active-low input pin for resetting boundary-scan circuitry. This pin has an internal pull-up resistor. For more information, please refer to Power-up Behavior of ProASICPLUS Devices application note. Special Function Pins RCK Running Clock A free running clock is needed during programming if the programmer cannot guarantee that TCK will be uninterrupted. If not used, this pin has an internal pull- up and can be left floating. NPECL User Negative Input Provides high speed clock or data signals to the PLL block. If unused, leave the pin unconnected. PPECL User Positive Input Provides high speed clock or data signals to the PLL block. If unused, leave the pin unconnected. AVDD PLL Power Supply Analog VDD should be VDD (core voltage) 2.5 V (nominal) and be decoupled from GND with suitable decoupling capacitors to reduce noise. For more information, refer to Actel’s Using ProASICPLUS Clock Conditioning Circuits application note. If the clock conditioning circuitry is not used in a design, AVDD can either be left floating or tied to 2.5 V. AGND PLL Power Ground The analog ground can be connected to the system ground. For more information, refer to Actel’s Using ProASICPLUS Clock Conditioning Circuits application note. If the PLLs or clock conditioning circuitry are not used in a design, AGND should be tied to GND. |
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